Security value estimating apparatus, security value estimating method, and computer-readable recording medium for estimating security value

Abstract

A security value estimating apparatus for estimating a security value of an unregistered data item includes a primary data generating part for generating various types of primary data based on the unregistered data item, a data amount calculating part for calculating the value of the data amount of each type of the primary data, a similarity degree calculating part for calculating a degree of similarity of the primary data with respect to various types of secondary data that are generated based on a registered data item, a security value estimating part for estimating the security value of the unregistered data item by selecting a secondary data item from the secondary data based on the value of the data amount calculated by the data amount calculating part and the degree of similarity calculated by the similarity degree calculating part and applying the security value corresponding to the selected secondary data item.

1 . A security value estimating apparatus for estimating a security value of an unregistered data item, the security value estimating apparatus comprising: 
 a primary data generating part for generating various types of primary data based on the unregistered data item;    a data amount calculating part for calculating the value of the data amount of each type of the primary data;    a similarity degree calculating part for calculating a degree of similarity of the primary data with respect to various types of secondary data that are generated based on a registered data item; and    a security value estimating part for estimating the security value of the unregistered data item by selecting a secondary data item from the secondary data based on the value of the data amount calculated by the data amount calculating part and the degree of similarity calculated by the similarity degree calculating part and applying the security value corresponding to the selected secondary data item.    
   
   
       2 . The security value estimating apparatus as claimed in  claim 1 , wherein the data amount calculating part selects at least one of the secondary data items from the secondary data based on the value of the calculated data amount, wherein the similarity degree calculating part calculates the degree of similarity between the secondary data item selected by the data amount calculating part and the various types of secondary data.  
   
   
       3 . The security value estimating apparatus as claimed in  claim 2 , wherein the data amount calculating part normalizes the calculated value of the data amount and selects the secondary data item based on the normalized value.  
   
   
       4 . The security value estimating apparatus as claimed in  claim 1 , wherein the similarity degree calculating part calculates the degree of similarity for all of the various types of primary data generated by the primary data generating part.  
   
   
       5 . The security value estimating apparatus as claimed in  claim 4 , wherein the similarity degree calculating part multiplies the calculated degrees of similarity with the value of the data amount.  
   
   
       6 . The security value estimating apparatus as claimed in  claim 1 , wherein the security value estimating part estimates the security value of the unregistered data item by selecting a predetermined degree of similarity calculated by the similarity degree calculating part and applying the security value corresponding to the secondary data item of the selected degree of similarity.  
   
   
       7 . The security value estimating apparatus as claimed in  claim 1 , wherein the security value estimating part estimates the security value of the unregistered data item by adding the degree of similarity for each type of secondary data, selecting one of the secondary data items from the secondary data based on the total of the added degree of similarity, and applying a security value corresponding to the selected secondary data item.  
   
   
       8 . The security value estimating apparatus as claimed in  claim 1 , wherein the value of the data amount is the size of at least one of the primary data and the secondary data.  
   
   
       9 . The security value estimating apparatus as claimed in  claim 1 , wherein the value of the data amount is a proportion of data size of at least one of the primary data and the secondary data.  
   
   
       10 . The security value estimating apparatus as claimed in  claim 1 , wherein the value of the data amount is a value based on a scale indicative of the amount of data for each type of the primary data.  
   
   
       11 . The security value estimating apparatus as claimed in  claim 1 , wherein the value of the data amount is a proportion of data amount.  
   
   
       12 . The security value estimating apparatus as claimed in  claim 1 , further comprising: 
 a registered data obtaining part for obtaining the registered data item;    a secondary data generating part for generating the various types of secondary data based on the registered data item.    
   
   
       13 . The security value estimating apparatus as claimed in  claim 12 , further comprising: 
 a data storing part for storing the secondary data generated by the secondary data generating part.    
   
   
       14 . A security value estimating method for estimating a security value of an unregistered data item, the security value estimating method comprising the steps of: 
 a) generating various types of primary data based on the unregistered data item;    b) calculating the value of the data amount of each type of the primary data;    c) calculating the degree of similarity of the primary data with respect to various types of secondary data that are generated based on a registered data item; and    d) estimating the security value of the unregistered data item by selecting a secondary data item from the secondary data based on the value of the data amount calculated in step b) and the degree of similarity calculated in step c) and applying the security value corresponding to the selected secondary data item.    
   
   
       15 . The security value estimating method as claimed in  claim 14 , wherein step b) includes a step of selecting at least one of the secondary data items from the secondary data based on the value of the calculated data amount, wherein step c) includes a step of calculating the degree of similarity between the secondary data item selected in step b) and the various types of secondary data.  
   
   
       16 . The security value estimating method as claimed in  claim 15 , wherein step b) includes a step of normalizing the calculated value of the data amount and selecting the secondary data item based on the normalized value.  
   
   
       17 . The security value estimating method as claimed in  claim 14 , wherein step c) includes a step of calculating the degree of similarity for all of the various types of primary data generated in step a).  
   
   
       18 . The security value estimating method as claimed in  claim 17 , wherein step c) includes a step of multiplying the calculated degrees of similarity with the value of the data amount.  
   
   
       19 . The security value estimating method as claimed in  claim 14 , wherein step d) includes a step of estimating the security value of the unregistered data item by selecting a predetermined degree of similarity calculated in step c) and applying the security value corresponding to the secondary data item of the selected degree of similarity.  
   
   
       20 . A computer-readable recording medium on which a program is recorded for causing a computer to execute a security value estimating method for estimating a security value of an unregistered data item, the security value estimating method comprising the steps of: 
 a) generating various types of primary data based on the unregistered data item;    b) calculating the value of the data amount of each type of the primary data;    c) calculating the degree of similarity of the primary data with respect to various types of secondary data that are generated based on a registered data item; and    d) estimating the security value of the unregistered data item by selecting a secondary data item from the secondary data based on the value of the data amount calculated in step b) and the degree of similarity calculated in step c) and applying the security value corresponding to the selected secondary data item.